The nouveau drivers are just barely enough to have a desktop, anything actually needing a GPU will perform very poorly (in my anecdotal experience with 4K). Or, to put it another way, choosing an NVIDIA card is choosing their proprietary drivers.
So you’re left with AMD (and Intel). The open amdgpu driver is pretty good and is suitable for gaming. Which I do.
I have no experience with Intel, but I believe their open drivers are pretty good.
So I recommend AMD.
Huh, all see is *******